Device for the manufacture of paper cups

ABSTRACT

A device in which a conic-shaped mantle and a cup-shaped bottom portion are assembled on a conic-shaped pin by a mantle seam sealing operation, and a placement of the bottom portion within the narrower end of the mantle, projecting beyond the pin, in flanged interlocking relationship. In the sealing operation a movable member is associated with the pin to be extensible along the seam line of the mantle which is received over the pin and has a portion extending beyond the pin, so as to provide an abutment surface at this portion against which a pressing member urges the mantle at the seam line. After this movable member is retracted another member places the bottom portion in position in the mantle and a still further member urges the bottom portion and mantle into interlocking relationship.

United States Patent Schmidt et a1.

June 6, 1972 DEVICE FOR THE MANUFACTURE O PAPER CUPS Inventors: WernerSchmidt; Fritz Wommelsdorf, both of Hamburg, Germany MaschinenfabrikRissen GmbH, Hamburg-Rissen, Surrheid, Germany Filed: June 5, 1973 Appl.No.: 367,156

Assignee:

Foreign Application Priority Data Germany 22274131 US. Cl. 93/36.5 R,93/36.8, 93/39 C, 93/39.1 R, 93/55.1 R

Int. Cl B31b 1/28 Field of Search 93/36.1, 36.3, 36.5 R, 93/36.5 SS,36.8, 39 C, 39.1 R, 39.2, 39.3, 55.1 R, 59 R, 59 CE, 94 FC ReferencesCited UNITED STATES PATENTS l/l935 Cooley 93/39.3

[ Dec. 24, 1974 2,834,260 '5/1958 De Wiess 93/ 91 R 3,157,339 11/1964Negoro 3/551 R x 3,547,012 12/1970 Amberg et al. 93/36.5 n

Primary Examiner-Roy Lake Assistant ExaminerJames F. Coan ABSTRACT Adevice in which a conic-shaped mantle and a cupshaped bottom portion areassembled on a conicshaped pin by a mantle seam sealing operation, and aplacement'of the bottom portion within the narrower end of the mantle,projecting beyond the pin, in flanged interlocking relationship. In thesealing operation a movable member is associated with the pin to beextensible along the seam line of the mantle which is received over thepin and has a portion extending beyond the pin, so as to provide anabutment surface at this portion against which a pressing member urgesthe mantle at the seam line. After this movable membet is retractedanother member places the bottom portion in position'in the mantle and astill further member urges the bottom portion and mantle intointerlocking relationship.

5 Claims, 5 Drawing Figures PATENTEU UEB24 I974 FIGZ FIG]

FIG.4

DEVICE FOR THE MANUFACTURE OF PAPER CUPS The invention concerns a devicefor the manufacture of cups made of paper or similar material andconsisting of a conic mantle and a bottom portion or part, which isinserted in this mantle withits edges pointing toward the narrower-endof the mantle. As thus inserted the outer surface of these edges restsagainst the inner surface of the wall of the mantle.

Since the bottom surface of the bottom part is situated at a certaindistance from the mantle, it must have an exterior diameter greater thanthe interior diameter of the narrower end of the mantle if its edge isto rest against the inner surface of the mantle. ln connecting the twoparts, the bottom part has, therefore, so far been introduced from thewider end of the mantle. With a first, already known device, the cutmantle is rolled around a pin, which must be at least as long as themantle if it is to form an abutment for bracing the entire mantle vseamagainst a pressing cheek.

Along this seam, the mantle overlap, which is provided with a layer ofglue or a thermoplastic sealing film, is sealed or glued together by theuse of a pressing cheek, applying heat if necessary, until theconnection is tight. Thereafter, the mantle removed to another pin onwhose front the cup bottom has been placed previously. This new pin isshorter at its'narrower end than.

the first pin in order to allow space for the bottom in the mantle.

The above described device provides on the one hand, the advantage of aneven seal of the mantle seam along its entire length, but, on the otherhand, it has the inconvenience of requiring the use of two series ofsupporter pins for the mantle, which, in turn, require normally tworevolving tables for each series of pins.

A second known device avoids the double pin series by rolling andsealing the mantle on a pin after having placed the cup bottomon thefront or in a recess of the front of the pin. In this case, the pin mustbe shorter than the cup, as the part of the case which is to receive thecup bottom, must be free of the pin. Therefore, the pin acts as abutmentagainst the pressing cheek for only part of the total length of themantle seam. Therefore for the time being, the seam can be sealed onlyfrom the open cup border to near the bottom. The remaining part of themantle seam near the bottom will be glued or sealed, once the bottom isjoined to the mantle. When the bottom edges are pressed on to themantle, the still open part of the mantle is sealed simultaneously.Since this is carried out in two different work positions and sincethere are varying numbers of paper layers in the two areas to be sealedthere frequently are badly sealed or unsealed parts of the joint nearthe bottom surface of the bottom part, i.e. in the front of the pin.

The object of the invention is, therefore, to provide a device of theabove-mentioned kind, that avoids the necessity of two pin series aswell as insuring a complete and total sealing of the mantle seam. Thesolution according to the invention consists in a device with thefollowing characteristics:

a. The device has an arrangement for the sealing of the seam of themantle part comprising a conic pin to hold the mantle part, a pressingcheek which presses the mantle seam from outside against the. pin and amovable abutment in the pin on the other side of the 1 of operation. Thefront part 3 of the pin mantle seam having a surface parallel to thesurface of the pin. Both the pressing cheek and the abutment cover thetotal length of the mantle seam.

b. The device includes an arrangement for the insertion of the bottom inthe mantle, including a conic pin to hold the mantle, which on itsnarrower end, according to the height of the bottom, shorter than themantle,

tle.

c. The same pin which is used to-hold the mantle, is also used in thedevice to seal the seam and to insert the bottom. I

d. The abutment comprises a movable part which, in the seam sealingdevice acts to extend the pin surface at the narrower end of the pin andwhich can be removed when the bottom is inserted and/or worked on.

Since the abutmentin the device for the sealing of the mantle seamextends over the entire length of the seam, the seam can be sealedcompletely, even near the bottom surface. On the other hand, the pinleaves along its mantle line. During the operation of mantle formationit is pushed beyond the narrow end of the pin so as to have the totallength of the seam supported by the strip. Subsequently prior to theinsertion of the bottom, the strip is drawn back to have its front edgecoincide exactly with that of the pin. I

' Another advantageous possibility is to mount a movable part of theabutment on the front of the pin from its free side, the front side ofthe pin and the nearer side of the movable part being fitted withinteracting grooves which insure the required support of the movablepart. I

The invention is described in detail below, with refer ence to thedrawings: U

FIG. 1 shows a longitudinal section through a pin with a movable stripserving as an abutment;

FIG. 2 is a top plan view of the pin, according to FIG. I;

FIG. 3 shows a longitudinal section through a pin with a movableabutment part that can be mounted from the outside;

FIG. 4 shows the end of a pin with mounted mantle and an inserted bottomportion and FIG. 5 shows a partial section through a bottom edge of thepin and adjoining parts during widening of the bottom portion in themantle. FIG. 1 represents a pin 1 of conic form, fixed on, e.g. arevolving table-above a shaft which is centrically designed on itsthicker end. The machine has a number] of such pins which progressthrough the various points is flat and perpendicular to its medial axis.

Along a line of the'mantle, there is a groove 4 in the outer surface ofthe pin into which a strip 5 is fitted. This strip can move along thelength of the groove and the outer surface of the strip conforms to theconic form of the pin. The strip must be able to slide at least I and apart for the insertion of the bottom into the manbetween a firstterminal position in which its front surface 6, parallel tofront surface3, coincides with front surface 3 (dashed line in FIG. 1) and a secondterminal position in which front surface 6 extends beyond front surface3 of the pin to allow sealing of the mantle seam along the desiredlength. To guide the strip, it is fitted with a roller which acts withappropriate guidance devices, such as guide-rollers, which have not beenincluded in the drawing. The guidance device is synchronized to arrangefor the strip to be pushed beyond front surface 3 during the phase ofthe operation when the mantle seam is sealed and to remain in the pinwhen the bottom is fixed to the mantle. The mantle to be formed andsealed on pin 1 is indicated as 7 in FIG. 1. Above strip 5, the mantleseam 8 can be recognized by the double layer of material. The striprepresents the abutment for pressing cheek l l.

Another abutment is shown in FIG. 3. Those parts that have already beenexplained in FIG. 1 have the same numbers. Pressing cheek 11 is shownabove mantle seam 8. On the other side, the seam is supported partly bypin 1 itself, partly by a supporting part 12. This supporting partconsists of a guiding shaft 13 which can be moved axially on a guidingpivot not shown, and of a shoe 15 provided with a centering extension 16which sits in a centered recess 17 arranged in the middle of the frontpart of pin 1. Both centering extension 16 and centering recess-l7 areconic. Moreover, the shoe 15 has an arched side part 18, which duringthe phaseshown when the shoe sits on front part 3 of the pin 1,corresponds to the conic form of the pin and rests against the innersurface of seam 8 to back it against cheek ll. Guiding parts 13 and 14are inclined compared to the longitudinal axis of pin 1 to allow theunimpeded movement of the shoe l5 throughthe protruding edge 19 of themantle into this edge. After seam 8 has been sealed in its entire lengththrough this pressing operation, support part 12 can then be removed.The pin 1 supporting the sealed mantle progresses, after sealing oftheseam, to another point in the machine, where bottom 20, comprisingbottom surface 21 and edges 22, is introduced by part a (FIG. 4). The

present example supposes that the bottom portion, having been preformedwith a diameter smaller than the end of the mantle, is introducedthrough the narrow open end 23 of the mantle. As indicated above, thebottom could also be brought into the desired position within the mantleby other means, for instance by pushing it into an empty space thatreaches from the front side of the short pin toward its thicker end,before sealing the mantle, as explained in U. S. Pat. No. 3,157,339. Insuch a case, the movable strip 6 cannot be used, but

' the device according to the invention, with support 17 can be used.

After insertion of the bottom, the mantle edge is flanged in a mannerseen in FIG. 5, using a flanger 24 parallel to pin 1 and moving axiallyto the latter. This A surface of mantle 7 as demonstrated by the fullline in FIG. 5. Afterwards, the' edges may be sealed to the mantle.

What is claimed is: I

.1. In a device for the manfacture of cups of paper or similar material,the cupsconsisting of a conic-shaped mantle and with a cup-shapedbottomportion inserted into the mantle with the side edges pointing toward thenarrower end of the mantle and with the outer surface of the bottomportion being joined to the inner surface of the mantle, the improvementwhich comprises:

a. a conic-shaped pin adapted to receive a conicshaped mantle inoverlying relationship thereon, said mantle, when so received, partiallyextending beyond said pin at the narrower face thereof, said mantlehaving a seam portion extending along the length thereof:

b. a pressing cheek movably disposed adjacent said conic shaped pin andopposite said seam portion of said mantle; I I

0. means movably disposed to be moved adjacent the seam portion at theedge extending beyond said pin and within said mantle opposite saidpressing cheek, whereby said seam portion is supported-by an abutmentsurface, in relationship to said pressing cheek, along said pin andalong said means.

2. A device as defined in claim 1 wherein said means is a strip disposedin a groove in said pin at the peripheral surface thereof, said striphaving a surface conforming to the surface of said pin, and said stripbeing movable between aposition in which it is completely confinedwithin said-pin and a position wherein a portion thereof extends beyondthe narrower end of said mantle.

3. device as defined in claim 1, wherein said means is disposed adjacentthe narrower end of said pin and is adapted to be moved into contacttherewith, said -means having a shoe thereon which, when said meansbottom portion of the cup upon the narrower face thereof when said meansare displacedfrom abuting relationship with the seam line above saidnarrower face, said bottom portion, when said deposited, having thebottom wall in contact with said narrower face and said side edgesextending adjacent to the inner surface of said mantle. I

5. A device as defined in claim 4 further comprising a third meansmovable axially of said pin and toward said portion of said mantleextending beyond said narrower face and said side edges of saidcup-shaped bottom portion, said third means being adapted to move, aftersaid second means is retracted from' within said mantle, against saidportion of said mantle and said side edges of said cup-shaped bottomportion extending beyond said narrower surface of said pin to urge saidpor-

1. In a device for the manfacture of cups of paper or similar material,the cups consisting of a conic-shaped mantle and with a cup-shapedbottom portion inserted into the mantle with the side edges pointingtoward the narrower end of the mantle and with the outer surface of thebottom portion being joined to the inner surFace of the mantle, theimprovement which comprises: a. a conic-shaped pin adapted to receive aconic-shaped mantle in overlying relationship thereon, said mantle, whenso received, partially extending beyond said pin at the narrower facethereof, said mantle having a seam portion extending along the lengththereof: b. a pressing cheek movably disposed adjacent said conic shapedpin and opposite said seam portion of said mantle; c. means movablydisposed to be moved adjacent the seam portion at the edge extendingbeyond said pin and within said mantle opposite said pressing cheek,whereby said seam portion is supported by an abutment surface, inrelationship to said pressing cheek, along said pin and along saidmeans.
 2. A device as defined in claim 1 wherein said means is a stripdisposed in a groove in said pin at the peripheral surface thereof, saidstrip having a surface conforming to the surface of said pin, and saidstrip being movable between a position in which it is completelyconfined within said pin and a position wherein a portion thereofextends beyond the narrower end of said mantle.
 3. A device as definedin claim 1, wherein said means is disposed adjacent the narrower end ofsaid pin and is adapted to be moved into contact therewith, said meanshaving a shoe thereon which, when said means contacts said pin, extendsalong the seam line above said narrower end of said pin and provide anabutment surface, in conjunction with the surface of said conic-shapedpin, against which the seal line can be pressed by said pressing cheek.4. A device as defined in claim 1, further comprising second meansdisposed adjacent the narrower end of said pin and movable axially ofsaid pin to deposit a bottom portion of the cup upon the narrower facethereof when said means are displaced from abuting relationship with theseam line above said narrower face, said bottom portion, when saiddeposited, having the bottom wall in contact with said narrower face andsaid side edges extending adjacent to the inner surface of said mantle.5. A device as defined in claim 4 further comprising a third meansmovable axially of said pin and toward said portion of said mantleextending beyond said narrower face and said side edges of saidcup-shaped bottom portion, said third means being adapted to move, aftersaid second means is retracted from within said mantle, against saidportion of said mantle and said side edges of said cup-shaped bottomportion extending beyond said narrower surface of said pin to urge saidportion and said side edges into a flanged interlocking position.